%!TEX TS-program = xelatex
%!TEX encoding = UTF-8 Unicode

\documentclass[11pt,tikz,border=1]{standalone}
\usetikzlibrary{calc,positioning}
\usepackage{pgfplots}

\usepackage{cjkfonts}

\begin{document}

  \begin{tikzpicture}

      \begin{axis}[
          width=6cm,
          height=6cm,
          xlabel={\normalsize $x$},
          axis lines=left,
          tick label style={font=\tiny},
          label style={font=\tiny},
          title style={font=\scriptsize},
          xtick={0,1},
          ytick={1},
          % minor tick num=1,
          title={顶部隐藏神经元的输出}
        ]
        \fill [fill=green!10] (axis cs:0.43,0.002) -- (axis cs:0.57,0.002) -- (axis cs:0.57,1) -- (axis cs:0.43,1);
        \addplot[
          orange,
          thick,
          domain=0:1,
          samples=201
        ] {
          1/(1 + exp(-(100 * x + (-50))))        
        };
      \end{axis}

  \end{tikzpicture}

\end{document}
